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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c149045a7ee54e0f2fbc594960403228a58773c4cd1a0bb88e65a6bcafb872ec' 
  AND token = 'z93nc5VD9165gEarbVb+PdQNana0cCPU0ijCazwacBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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