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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176dc095fb16ef3870dbf5706f879773c66d4bd986d2b97ba7a778892911ea80' 
  AND token = 'H0WM8GfhO1zaG1rSzexv2EShGbvgGA4RSFTfr+L/pF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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