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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919d959677eaf6e0db4b90f4ff716ac0e17dbdf5729d15b728a0cc082739b499' 
  AND token = '7uVpc5BlF0oIYOELaSWkkttEhecfYx33Ifjg7z3hp0o=' 
  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"
    }
  }
}