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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7d763916a585dedcdda9255b4a1765005292eafee66469adf626d9356ebd68' 
  AND token = 'jm3IOWLzE+fm9ybMv2Fsy8pWahN21tHG4rj+yb330cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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