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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20422a896f13569282690c523fadd5d34c1f504ee5ddb801433161cadc1f0834' 
  AND token = 'EOYEGe15x6cssLqqfc2TKviBu+wXxew7xr/poLLWtGw=' 
  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"
    }
  }
}