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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e4026685e9263077dfcafb24d15ed687dcebd59af86f91b5e5b01c30510c4a' 
  AND token = 'AvW67KBFYbb8ciQ5yEVo5b4UlRkc4HbM0T3vz4sHfag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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