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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be975e897a0599bf16fb92eb1cfd34584fbf77f22eb25edf443f5832f79a1d9a' 
  AND token = 'odrKAB12WpuTT0z/aiHWr39lfAzCVqw34y45wBFlUkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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