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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4959c6acfc3b1dbc2a2ae86fbfaf63b6f37e61f0b5f7cda64f73aad203a8f18' 
  AND token = 'f79FlkOATGx9cnufcVVHfG/t2x5ZSi+5QryENGZcdzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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