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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efe58fd93b56839a8c5b21cdb8c0b11ffb24259ac03be8340c882b45eddfd92' 
  AND token = 'eykZrp7b6V5ONG5POm4PepBMYpXOpUY0RjQqpaoOmvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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