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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b661f3b63ccf23cc3496dcac60126c49b38beb70fc70676fdff0b04a2316ce7a' 
  AND token = '+IXW2YaJgP0EfkdaS9Tm8uJpUxryVxNfwsu4k3AHNbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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