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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c3def8d542bdacbb4aa65ae27c3450405541b98b8a2398fa69ed1ee397f6b0' 
  AND token = '+KNVQ4ZEZUdjnBHVRvRe/k91Fnc8i6EIse3R2hTQCf0=' 
  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"
    }
  }
}