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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc72a3d2d9e8a63f5ed2d4d166614f655f65751e06d206f9c0c90652be0f4424' 
  AND token = '/mKCpTL+M25FRkHReGO9L4yQCkHE4i8cQwky5aY0CUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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