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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05af49fa156bb2f8cb355f26e8f798eb2094caf58894fe051ca0a12eda2a0f58' 
  AND token = 'zePV3UjXQy3FHqLzmj14DdAENZu1m/vtEOYSF1vt52I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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