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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0e9ec514b3f94ac1c265ee2e24a851a0b94ae9c4e945526ebcf586ba578f9a' 
  AND token = 'at/+9RuN1w+xxfFArbHQotc7s+IuBWmbXAgQpbiGpwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}