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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45db5191e443afd229ffc28d9385a2127e73b00c55783ea00677cb6815e1e3a4' 
  AND token = '7Xn8omvljVve3i6NFv+6cj3N5p0N71hqiOG/vEpmQbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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