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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc18cc318b5b42bb05ae692ad1c9960695ddc8a513eaee6aeda3e3697b4f02b1' 
  AND token = 'ZA2crPOYe3PIToiVeXuue6T0HE69PBSHPAWkXsPBr2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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