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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a6e03e62dff0e50040f1c1f67d75f714d9cd03b068a8fa88bccfc0bb15c633' 
  AND token = 'GkeV32D8AOT3rcIrUflngJJwVlbiHGmrsirwGpp0+/Y=' 
  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"
    }
  }
}