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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c40e7a7e805b670d2e8f6590a51533c0f393e60eb09f9f358f56cedaac0317' 
  AND token = 'Z84CH7ZLrTdmRBFVMM51ZST+3egOClQOYDblDd9FVBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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