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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a616e1840c3c5eec2757f46a5e10987ed744793f55d1dc8a8d6b86455bc2809d' 
  AND token = 'RJsqOhVICz6yokiw5kVmnD4VDk90Ij4vZUjt0SdFkek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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