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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f5010e2d8da440b9491eabb539f6b17a8e03b01dc6a0f39111235291480a30' 
  AND token = 'r/SxPt9JHaQ9+pL9v/kDnGsLmd4/e+fWUnVQ1SmUeK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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