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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf909d3afd6ff6566d3853a7f1dc341fa5efdb10e0ae3d1ffb2849129e05720' 
  AND token = 'ys79sYxdDE1/XlPlcNMMUINLgBRsMbcFF2oz2t4NuAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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