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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b102b89d219e7013c290ec45e7237596281c23128aee32813df94f5f38eaf4b' 
  AND token = 'cQUPx21E+ziKrMfJMt+UB2Gl5yKJROzhajAHgURspz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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