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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d6b977c000f6e4ea3eb06a05d1ab16316a135ce981e6c81376090402b3a74e' 
  AND token = 'PEyMsAPbBc/ZKbi88N4s/ZaXI2n5/DT+OBKU2L8btes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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