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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8ca10d385d69774a0dea8fb2ff75ff66e5f44ea8c31428fd3f06121afbf39c' 
  AND token = 'xLB/wz3hH5AUUb8lYsr+2ok4/RvvbuD4p4Gcp0HsWns=' 
  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"
    }
  }
}