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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58d21d5e8ea2748b3eeadda34f5a6cca1856c04fe3d736c970134607fcd072c' 
  AND token = 'Dd9Fbzw8HNpIb+n7Ej8/1fN5ACwJ1SxBewi+MycZ0CE=' 
  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"
    }
  }
}