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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca48e69d4f2bf1d9e6c3910a987e4b4bdb7c8a5c2f2ec223c1dd5998917ec453' 
  AND token = 'GucUK5Ch17lSc1t0u3cuMvfzfYMoKee8tRkbbamEYBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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