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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92d5254e8fee109123ea59a297c0ac32c2bfb86859889477f53b96e2192567b' 
  AND token = 'XgaqoGHOudKPg+dXvBT6JYqsddSB1dpibEEe6cTJub0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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