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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d5e70a16895ded70d3223629f166a24425ece8df5805e741df25966f515dbe' 
  AND token = 'YKY+jvN5PJ3b63Q16CsNDs2pQ6ctBWke5MSCdHXL1qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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