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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea653edff5ae29eaf2b0f8fab22635b7a810b87b4c764cb97c966e598f452351' 
  AND token = '7l/+83ylZe2n3SiDjF8TaDUeX7+UB+gRs3uhleLt3o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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