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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f235e925362c29ee15949c81ff2b2074c9b693ff3189fe2b5f893e59a174a2bf' 
  AND token = '3F7T0Cl9c9e/690NUap9GHBXcDMX3kRf8ei0pkjtVGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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