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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1609ecf50d9e3c345894700035171766ca092b98f54fd08054468ba98572e3' 
  AND token = 'DMCu84ZMwy2X1VRoN2+4JOLXZ+P6Kfo7PZHV+n3qzss=' 
  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"
    }
  }
}