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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e865dabf65983308a8cbad15c8b3b1c3cd715366b2ba565c937bb0b858ad4a' 
  AND token = 'e8H2p7PfrdLwe1x31ACi+HzPpnobzL6Q9d/waLUAYQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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