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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3c2ed62666be3aad039c8ebceec5766b7231968db38c307f88f0803f22a3f5' 
  AND token = 'PqRE6NV67rbAAK4rDkhSbIhbqJGK4sufw8pAlxVskzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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