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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1ff00777a824e248c77837ed4fa793dd95568d1ec91dbc0323b4cceade928b' 
  AND token = '/OUM2cJREeS5Ms4qQM7f+Kp6Zrc1Pb4lsJ1HGT4ReSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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