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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76d70d38e8f8d92853c9e087c4b4a626f99ea83590081f2d695e14a32adabc9' 
  AND token = '1qP0Oc0UnicrYfj3vZR95Lj7Fk7a02uL4nsVWItt+/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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