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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca03780aa1cb85330b9e7bd2151b378c565c2d73e6ad87ddd7dfc7f641129b7' 
  AND token = '/fLqxBS1dadXjSNUUuRBggTC464zg6L5NtRtHm+KkE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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