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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8b31127e58febe0f65baeab7a98b1a70727cc69e858fff3bbc820e6acf13c1' 
  AND token = 'BulYPJn4r11oVY1VGfpHMahb2nd7xxEBFky82StyO5k=' 
  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"
    }
  }
}