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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619d9cde035a665b98c8a1a6fe165abeeb2a7c94c39ae67c0d4372de0bc52bc6' 
  AND token = 'YkbSY1jsw6vC9Miu4WzFNiI7+a0x84/dDm0utGAX85w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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