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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9098880cdcc13d467c387d1e0950d745da1c17e57a44ebc1ecc8d49cf3f2c6' 
  AND token = '2DK7/L2tOvPWnUPYstfpml/LAzhr49l2SaP9HKz7QN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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