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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6915111050d6bb26e61a5878e418d0a0fe3009f88fffc9e3c99690eb2394f8c0' 
  AND token = 'yy+YpV+Z/o6OMdUhI3KblVXrcmZYsT5kd9HHYY7FSMw=' 
  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"
    }
  }
}