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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf37be74baab5da4fdb752e3535c85fe1bfd040b49a798d8c9c5c7c681737d50' 
  AND token = 'E7ynTpA0r+j9Cyz9O2FzC1kOedOWBjB46s8lYrXrNwA=' 
  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"
    }
  }
}