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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f42b4f5352d11e42b0db96e3ea3deba7e245ceabd01bba76d43913a64c1d7f' 
  AND token = 'csMlEle7aDoKPunoM4sINWi+WSwuLSHzfgqmn0i2uek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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