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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4692db6d4c5a2a52a3e8910645e627d73e72e0bcbca5362db8fbd36a7d20dcd3' 
  AND token = '+SwsBg9nvU0GU5Ir7qgyYZdE6WmAegxvl3ue44L7G9U=' 
  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"
    }
  }
}