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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0973e2380e89eb71dd8e053506a61196d02577e414752c9e3e5c9013ef164a9' 
  AND token = 'hvGTgTFOETvg9CIaPqxaw+eN5/XpG7GkGTCymb8RN3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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