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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa3ebc56464df8dad9c6ebe6613271a9295d5c524213fdfd69b0e2a894dc9a6' 
  AND token = 'aDKgC/eKNxJywjwcvolf71g/MSPyk4OdEfX2unroDQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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