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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eac4c95b58d71ae01393db09d72cadaad27ad0e51e2b66947bf2b05bc3532b6' 
  AND token = 'Ee2n0sxgl0DAffPaRG0XJ0HLnDQQjoaFxBsm5He/O/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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